Benefit Plans (Components of net periodic cost (benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 17	$ 15
Expected return on plan assets	(38)	(38)
Amortization of net actuarial (gain) loss	7	12
Total net periodic pension cost (benefit)	$ (14)	$ (11)